Impact of Asian continental outflow on the concentrations of O3, CO, NMHCs and halocarbons on Jeju Island, South Korea during March 2005

H. L.A. Wong, Tao Wang, A. Ding, D. R. Blake, J. C. Nam

Research output: Journal article publicationJournal articleAcademic researchpeer-review

9 Citations (Scopus)

Abstract

As part of ABC-EAREX2005 experiment, numerous trace gases were measured at Gosan on Jeju Island, South Korea in March 2005 to characterize the impact of recent outflow from the Asian continent and to inter-compare measurement techniques used by participating groups. Here we present measurements of O3, CO, and whole air samples of methane, C2-C8non-methane hydrocarbons (NMHCs) and C1-C2halocarbons obtained during the study. The large temporal variations in the measured trace gas concentrations at Gosan were due to the transport of background marine air and of regional pollution mainly from the Chinese subcontinent. Average mixing ratios (± s.d.) were 54.6 (± 9.0) ppbv and 283 (± 100) ppbv for O3and CO, respectively. CO showed good correlations (r2= 0.62-0.81) with combustion tracers such as ethyne and benzene but poorly correlated (r2= 0.11-0.29) with light alkanes, suggesting that the latter were contributed by non-combustion source(s). Back trajectory analysis showed that air masses mainly originated from the North China Plains and northeastern China, which together accounted for 64% of the total trajectories. The highest mean mixing ratios of O3and combustion-derived species were found in air masses from eastern China and Korea, indicating the significant impact of emissions from these regions. Interestingly, air masses from northeast China contained elevated levels of light alkanes and the smallest ratios of ethyne/propane and benzene/propane among the air-mass groups, suggesting contribution from natural gas leakage in the upwind region, possibly from Siberia.
Original languageEnglish
Pages (from-to)2933-2944
Number of pages12
JournalAtmospheric Environment
Volume41
Issue number14
DOIs
Publication statusPublished - 1 May 2007

Keywords

  • Back trajectory
  • Carbon monoxide
  • Continental outflow
  • Nature gas leakage
  • NMHCs
  • Ozone

ASJC Scopus subject areas

  • Environmental Science(all)
  • Atmospheric Science

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